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canvas.html
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<!--
* @Author: your name
* @Date: 2020-09-14 20:11:10
* @LastEditTime: 2020-09-14 20:51:42
* @LastEditors: Please set LastEditors
* @Description: In User Settings Edit
* @FilePath: \web-datav\canvas.html
-->
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<canvas id="myCanvas" width="200" height="200" style="border: solid 1px
red;">
您的浏览器不支持canvas，建议使用最新版的Chrome
</canvas>
<script>
// 找到画布
var c = document.getElementById("myCanvas");
// 获取该canvas的 2D 绘图环境对象
var ctx = c.getContext("2d");
ctx.beginPath();
// 圆函数 arc(左边距, 上边距, 半径, ?, 周长)
ctx.arc(100, 95, 50, 0, 2 * Math.PI);
ctx.stroke();
// 长方形函数 strokeRect(左边距, 上边距, 宽度, 高度)
ctx.strokeRect(30, 145, 120, 30);
ctx.strokeRect(30, 30, 20, 115);
ctx.strokeRect(50, 30, 120, 15);
ctx.strokeRect(150, 45, 20, 130);
</script>
</body>
</html>